The work aims to study the processing rheology of PET materials and the UV absorption of PET sheets printed with curing ink. PET was compounded with different ratio of UV shielding agent (UVSA), then extruded into lenticular sheet for outdoor purpose, and printed with UV curing ink (UVCI). Then, FUA test was conducted on the PET lenticular sheet of different UVSA and sheet printed with UVCI. Under the same conditions, the addition of 1% UVSA (mass fraction) to the PET sheet increased the UV absorption wavelength from 330 nm to 380 nm, and the shielding effect of UV increased with the increase of UVSA content. The color difference DE of the sheet printed respectively with UVCI of cyan (C), magenta (M), yellow (Y), black (K) was all around 2.0 after aging for 32 h, and kept at around 3.0 after ageing for 168 h. With the increase of FUA time, the color difference of UVCI gradually increased, and the color difference of PET grating products also increased. In conclusion, the addition of UVSA is beneficial to improve the anti-aging performance of outdoor transparent PET sheets, and is an effective method to delay the aging rate and improve the weather resistance of UVCI.